What are the best material options for protecting sensors from a drill bit?

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fitz_calc
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I need a 5"x2"x1/8" 'cover' to protect some sensors from a drill bit. Occasionally the bit will run into the cover and chip away at material, etc.

I need the cover to be dull and black, coating with a surface treatment won't work because over time the coating will chip away. What are my options? Cover can be Al or Steel, cheaper is better, thanks for the help everyone!
 
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